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rps: add __rcu annotations

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Add __rcu annotations to :
	(struct netdev_rx_queue)->rps_map
	(struct netdev_rx_queue)->rps_flow_table
	struct rps_sock_flow_table *rps_sock_flow_table;

And use appropriate rcu primitives.

Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Eric Dumazet 2010-10-25 03:02:02 +00:00 committed by David S. Miller
parent f6318e5588
commit 6e3f7faf3e
4 changed files with 27 additions and 20 deletions
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12
include/linux/netdevice.h
View File

@ -585,15 +585,15 @@ static inline void rps_reset_sock_flow(struct rps_sock_flow_table *table,
table->ents[hash & table->mask] = RPS_NO_CPU;
}
extern struct rps_sock_flow_table *rps_sock_flow_table;
extern struct rps_sock_flow_table __rcu *rps_sock_flow_table;
/* This structure contains an instance of an RX queue. */
struct netdev_rx_queue {
struct rps_map *rps_map;
struct rps_dev_flow_table *rps_flow_table;
struct kobject kobj;
struct netdev_rx_queue *first;
atomic_t count;
struct rps_map __rcu *rps_map;
struct rps_dev_flow_table __rcu *rps_flow_table;
struct kobject kobj;
struct netdev_rx_queue *first;
atomic_t count;
} ____cacheline_aligned_in_smp;
#endif /* CONFIG_RPS */

12
net/core/dev.c
View File

@ -2413,7 +2413,7 @@ EXPORT_SYMBOL(__skb_get_rxhash);
#ifdef CONFIG_RPS
/* One global table that all flow-based protocols share. */
struct rps_sock_flow_table *rps_sock_flow_table __read_mostly;
struct rps_sock_flow_table __rcu *rps_sock_flow_table __read_mostly;
EXPORT_SYMBOL(rps_sock_flow_table);
/*
@ -2425,7 +2425,7 @@ static int get_rps_cpu(struct net_device *dev, struct sk_buff *skb,
struct rps_dev_flow **rflowp)
{
struct netdev_rx_queue *rxqueue;
struct rps_map *map = NULL;
struct rps_map *map;
struct rps_dev_flow_table *flow_table;
struct rps_sock_flow_table *sock_flow_table;
int cpu = -1;
@ -2444,15 +2444,15 @@ static int get_rps_cpu(struct net_device *dev, struct sk_buff *skb,
} else
rxqueue = dev->_rx;
if (rxqueue->rps_map) {
map = rcu_dereference(rxqueue->rps_map);
if (map && map->len == 1) {
map = rcu_dereference(rxqueue->rps_map);
if (map) {
if (map->len == 1) {
tcpu = map->cpus[0];
if (cpu_online(tcpu))
cpu = tcpu;
goto done;
}
} else if (!rxqueue->rps_flow_table) {
} else if (!rcu_dereference_raw(rxqueue->rps_flow_table)) {
goto done;
}

20
net/core/net-sysfs.c
View File

@ -598,7 +598,8 @@ static ssize_t store_rps_map(struct netdev_rx_queue *queue,
}
spin_lock(&rps_map_lock);
old_map = queue->rps_map;
old_map = rcu_dereference_protected(queue->rps_map,
lockdep_is_held(&rps_map_lock));
rcu_assign_pointer(queue->rps_map, map);
spin_unlock(&rps_map_lock);
@ -677,7 +678,8 @@ static ssize_t store_rps_dev_flow_table_cnt(struct netdev_rx_queue *queue,
table = NULL;
spin_lock(&rps_dev_flow_lock);
old_table = queue->rps_flow_table;
old_table = rcu_dereference_protected(queue->rps_flow_table,
lockdep_is_held(&rps_dev_flow_lock));
rcu_assign_pointer(queue->rps_flow_table, table);
spin_unlock(&rps_dev_flow_lock);
@ -705,13 +707,17 @@ static void rx_queue_release(struct kobject *kobj)
{
struct netdev_rx_queue *queue = to_rx_queue(kobj);
struct netdev_rx_queue *first = queue->first;
struct rps_map *map;
struct rps_dev_flow_table *flow_table;
if (queue->rps_map)
call_rcu(&queue->rps_map->rcu, rps_map_release);
if (queue->rps_flow_table)
call_rcu(&queue->rps_flow_table->rcu,
rps_dev_flow_table_release);
map = rcu_dereference_raw(queue->rps_map);
if (map)
call_rcu(&map->rcu, rps_map_release);
flow_table = rcu_dereference_raw(queue->rps_flow_table);
if (flow_table)
call_rcu(&flow_table->rcu, rps_dev_flow_table_release);
if (atomic_dec_and_test(&first->count))
kfree(first);

3
net/core/sysctl_net_core.c
View File

@ -34,7 +34,8 @@ static int rps_sock_flow_sysctl(ctl_table *table, int write,
mutex_lock(&sock_flow_mutex);
orig_sock_table = rps_sock_flow_table;
orig_sock_table = rcu_dereference_protected(rps_sock_flow_table,
lockdep_is_held(&sock_flow_mutex));
size = orig_size = orig_sock_table ? orig_sock_table->mask + 1 : 0;
ret = proc_dointvec(&tmp, write, buffer, lenp, ppos);